Mount Vernon · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Mount Vernon & neighbors — hit play
Every city on the map carries real forecast data from the same models as its city page, refreshed several times a day. The icon is the day's overall look; the number is the afternoon high.
Next 14 days at a glance
from the model forecast
Hottest day
102°
Tue, Sep 1
Coldest night
63°
Sun, Aug 23
Days with precip
6 / 14
of 14 forecast days
Nicest day
Thu, Sep 3
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
94° 66°
80% precip chance
Sat 5 – Sun 6 Sep
87° 65°
typical range
Sat 12 – Sun 13 Sep
84° 61°
typical range
Sat 19 – Sun 20 Sep
86° 60°
typical range
30 days — Mount Vernon
14 forecast + 16 climatology
Sun · Today Mostly cloudy
91°63°5%⌄
Wind16 mph NE
Gusts27 mph
UV index8 – High
Precip chance5%
Sunrise06:38
Sunset19:57
Mon · Tomorrow Sunny
88°64°6.8 mm⌄
Wind23 mph SE
Gusts34 mph
UV index9 – Very high
Precip chance68%
Sunrise06:39
Sunset19:55
Tuesday 25/8 Sunny
93°69°7%⌄
Wind15 mph SE
Gusts31 mph
UV index9 – Very high
Precip chance7%
Sunrise06:40
Sunset19:54
Wednesday 26/8 Mostly cloudy
86°76°12%⌄
Wind10 mph NW
Gusts20 mph
UV index9 – Very high
Precip chance12%
Sunrise06:41
Sunset19:53
Thursday 27/8 Mostly cloudy
94°71°2.4 mm⌄
Wind14 mph N
Gusts23 mph
UV index8 – Very high
Precip chance57%
Sunrise06:42
Sunset19:51
Friday 28/8 Sunny
95°72°3%⌄
Wind12 mph SE
Gusts21 mph
UV index9 – Very high
Precip chance3%
Sunrise06:42
Sunset19:50
Saturday 29/8 Mostly cloudy
93°66°8.2 mm⌄
Wind19 mph N
Gusts28 mph
UV index7 – High
Precip chance67%
Sunrise06:43
Sunset19:48
Sunday 30/8 Showers
94°67°11.9 mm⌄
Wind17 mph SE
Gusts28 mph
UV index7 – High
Precip chance80%
Sunrise06:44
Sunset19:47
Monday 31/8 Mostly cloudy
100°75°17.4 mm⌄
Wind22 mph NE
Gusts39 mph
UV index8 – Very high
Precip chance73%
Sunrise06:45
Sunset19:45
Tuesday 1/9 Sunny
102°68°6.6 mm⌄
Wind21 mph SW
Gusts33 mph
UV index9 – Very high
Precip chance66%
Sunrise06:46
Sunset19:44
Wednesday 2/9 Sunny
97°76°1.0 mm⌄
Wind16 mph SW
Gusts42 mph
UV index9 – Very high
Precip chance38%
Sunrise06:46
Sunset19:43
Thursday 3/9 Sunny
88°68°2%⌄
Wind10 mph N
Gusts20 mph
UV index8 – Very high
Precip chance2%
Sunrise06:47
Sunset19:41
Friday 4/9 Mostly cloudy
80°68°17%⌄
Wind15 mph E
Gusts29 mph
UV index6 – High
Precip chance17%
Sunrise06:48
Sunset19:40
Saturday 5/9 Showers
78°67°0.5 mm⌄
Wind12 mph E
Gusts26 mph
UV index6 – High
Precip chance50%
Sunrise06:49
Sunset19:38
Sunday 6/9 Rain (climatological)
87°65°13.1 mm⌄
Day≈82–92°
Night≈60–71°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
89°66°20%⌄
Day≈84–95°
Night≈61–72°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
91°67°20%⌄
Day≈85–96°
Night≈62–73°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Rain (climatological)
87°65°12.7 mm⌄
Day≈82–93°
Night≈60–71°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
84°64°20%⌄
Day≈79–90°
Night≈58–69°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
84°63°20%⌄
Day≈78–89°
Night≈58–68°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Rain (climatological)
80°61°13.5 mm⌄
Day≈75–85°
Night≈56–66°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
84°63°20%⌄
Day≈78–89°
Night≈58–69°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
88°66°20%⌄
Day≈83–94°
Night≈60–71°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
91°67°6.0 mm⌄
Day≈85–96°
Night≈62–73°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
90°67°20%⌄
Day≈85–95°
Night≈62–72°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
83°63°20%⌄
Day≈78–89°
Night≈57–68°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
81°62°8.3 mm⌄
Day≈76–87°
Night≈56–67°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
79°60°20%⌄
Day≈74–85°
Night≈55–66°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
86°64°20%⌄
Day≈80–91°
Night≈59–70°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
90°67°7.1 mm⌄
Day≈85–96°
Night≈62–72°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
How does a 30-day outlook work?
The first 14 days are a live model forecast. The back half of the month shows the typical range for those dates — useful for planning, not a literal prediction.
First 14 days: a real forecast, blended from NBM, ECMWF and GFS runs. Trust it most inside three days; by the second week treat it as a lean, not a promise.
Rest of the month: past day 14 we stop pretending to forecast and switch to the climate corridor — the range those dates have produced over three decades computed directly for Mount Vernon, with mild week-to-week wiggle.
Good question for this page: "Is late August usually humid in Chicago?" Bad question: "Do I need an umbrella on the 29th?" — three weeks out no one knows, and that's the honest answer.